Rocco Francis Marchegiano (Sep 1, 1923 – Aug 31, 1969), better known as Rocky Marciano, was an American professional boxer who competed from 1947 to 1955, and held the world heavyweight title from 1952 to 1956. He is the only heavyweight champion to have finished his career undefeated. His six title defenses were against Jersey Joe Walcott (from whom he had taken the title), Roland La Starza, Ezzard Charles (twice), Don Cockell and Archie Moore.
Known for his relentless fighting style, formidable punching power, stamina, and exceptionally durable chin, Marciano has been included by boxing historians in lists of the greatest boxers of all time, and is currently ranked by BoxRec as the 22nd greatest pound-for-pound boxer in history. His knockout-to-win percentage of 87.76% remains one of the highest in heavyweight boxing history.
In his youth, he worked out on homemade weightlifting equipment and used a stuffed mailbag that hung from a tree in his back yard as a heavy bag. He attended Brockton High School, where he played both baseball and football. However, he was cut from the school baseball team because he had joined a church league, violating a school rule forbidding players from joining other teams. He dropped out of school after finishing tenth grade.
Marciano's amateur record was 8–4. He began fighting permanently as a professional boxer on July 12, 1948. His last title bout was against 38-year-old Archie Moore, on September 21, 1955. The bout was originally scheduled for September 20, but because of hurricane warnings, it had to be delayed a day. Marciano was knocked down for a four-count in the second round, but recovered and retained his title with a knockout in round nine.
Marciano announced his retirement on April 27, 1956, aged 32. He finished his career at 49–0.
Marciano considered a comeback in 1959 when Ingemar Johansson won the Heavyweight Championship from Floyd Patterson on June 26, 1959. After only a month of training in nearly four years, Marciano decided against it and never seriously considered a comeback again.
Marciano is a member of the International Boxing Hall of Fame and the World Boxing Hall of Fame.